2008/12/3 hadley wickham <h.wickham at gmail.com>
Hi David,
facet_wrap and facet_grid function are both very usefull. But they are perhaps a bit redundant.
I disagree ;)
I was sure :-)
Conceptually they are rather different: facet_wrap is essentially a 1d layout, while facet_grid is a 2d layout. This has implications for how you specify the faceting, how the facets are labelled, and how the scales can vary. While I could probably force both into a single function, this is rather against the philosophy of ggplot2, which strives towards small objects which only do one thing. This tends to make things a little more verbose, but I think it makes things easier to understand.
OK. I thought that facet_wrap was created to "control" the layout of facet_grid plot with one-side formula, since a facet_grid plot with one-side formula should be (almost?) identical with a facet_wrap plot with nrow (or ncol) = 1. By the way, I've just test this thing to see the diffences between the two plots : d <- ggplot(diamonds, aes(carat, price, fill = ..density..)) + xlim(0, 2) + stat_binhex(na.rm = TRUE) + opts(aspect.ratio = 1) ## from official documentation d + facet_grid(~ color) d + facet_wrap(~ color) d + facet_wrap(~ color, nrow = 1) Erreur dans rep(list(nullGrob()), nrow * ncol - length(vec)) : argument 'times' incorrect Is this error normal ? facet_wrap must always give a 2d ribbon of panels ? Thank you very much for your patience. david